The "birds and the bees" as we know them are changing. A new process called in vitro gametogenesis (IVG) is currently being developed, and if successful, it will completely transform the way humans think about reproduction. "In 20 to 40 years, people will still have sex. But when they want to make babies, they'll go to a lab," predicts Stanford University Professor Henry T. Greely. It's also the premise of his book - The End of Sex and the Future of Human Reproduction. The designer babies of the future are closer than we think. Here's how the science behind in vitro gametogenesis is attempting to stretch the limits of human reproduction further than ever before.